Minimum CMake version

[menon-karthik]

Problem

Just curious why the CMake minimum version is set to 3.20? It builds fine with version 3.18, and that seems to be the version you need to use when building on the SDSC Expanse system (which I believe others use the solver on too). If there is a different set of modules, etc. that someone can point me to which works on Expanse with CMake >= 3.20, that would help!

Also, if a user does need to change the minimum version to build on a particular system, this needs to be changed in 8 different places:

>>> grep -ri 'cmake_minimum_required' .
./Code/CMakeLists.txt:cmake_minimum_required(VERSION 3.20)
./Code/ThirdParty/parmetis_internal/simvascular_parmetis_internal/CMakeLists.txt:cmake_minimum_required(VERSION 3.20)
./Code/ThirdParty/gklib_internal/simvascular_gklib_internal/CMakeLists.txt:cmake_minimum_required(VERSION 3.20)
./Code/ThirdParty/metis_internal/simvascular_metis_internal/CMakeLists.txt:cmake_minimum_required(VERSION 3.20)
./Code/ThirdParty/tinyxml/simvascular_tinyxml/CMakeLists.txt:cmake_minimum_required(VERSION 3.20)
./Code/ThirdParty/tetgen/simvascular_tetgen/CMakeLists.txt:cmake_minimum_required(VERSION 3.20)
./Externals/CMakeLists.txt:cmake_minimum_required(VERSION 3.20)
./CMakeLists.txt:cmake_minimum_required(VERSION 3.20)

Solution

I know it's a good idea to set the minimum to make sure everything is up to date, but maybe it makes sense to set the minimum version only once so building on systems that need to change this can be done with just one change?

Additional context

No response

Code of Conduct

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[dcodoni]

@menon-karthik The last module update on Expanse seems to be on 2021. Many modules are old versions including cmake. But if cmake is the only problem you have, you can just do this in your home:
wget https://github.com/Kitware/CMake/releases/download/v4.1.2/cmake-4.1.2-linux-x86_64.tar.gz
Once you untar it, you will find cmake inside the bin/ folder ready to use (no need to install anything) and you can export the path in your bahsrc.